Share This Article 1. On 15 May 1918 regular airmail service in the US was initiated by this government department. The US Army The US Postal Service The US Navy The Federal Aviation Administration 2. This battle is called the “Gettysburg of the Indian territory” The Battle of Honey Springs The First Battle of Cabin Creek The Second Battle of Cabin Creek The Battle of Perryville 3. For years it was a dictum at the US Army War College that no matter what the question, the answer was always this man. Grant Napoleon Clausewitz Mahan Loading …